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Materials Science and Engineering, University of Michigan

  MSE / Research / Projects / Bond Coats and Thermal Barrier Coatings

Bond Coats and Thermal Barrier Coatings
Collaborators: C. Levi, T. Bennett and A.W. Evans, UC Santa Barbara
Materials: Metals Ceramics
Application: Structural
Technique: Processing Characterization

In this program a multidisciplinary US-EU scientific team has been integrated to undertake a collaborative program to study the dynamics of layered, multifunctional surfaces. The focus is on coating systems that provide both thermal insulation and oxidation/corrosion protection for thermostructural components. The overarching intellectual challenge is establishing a science-based protocol for optimizing functionality while integrating thermomechanically and thermochemically disparate materials that experience large temperature extremes. These systems are inherently metastable and evolve via morphological changes, diffusional interactions and thermomechanically-induced stresses that generally degrade performance and limit durability. The program aims to develop a fundamental understanding of the underlying mechanisms that could provide a basis for designing superior, durable surfaces. The University of Michigan portion of the program has focused on the properties and performance of the buffer layer within the TBC system, with emphasis on the role of Platinum group metals (PGMs). The most advanced bond coats currently available contain Pt as an addition to a B2-NiAl layer. Phase equilibria and the role of interdiffusion have been primary considerations in the design and synthesis of new Ru-modified bond coats and in development of a deeper understanding of the role of Pt in current systems. This research is a collaboration between US and European partners, including KTH-Stockholm, Max Plank Institute - Stuttgart, Cranfield UK and the University of California, Santa Barbara.
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